NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Titan, Saturn's largest moon, as seen by the space probe Huygens during its successful descent on January 14th 2005. This image shows a high ridge area with tributaries leading into what appears to be a major river channel. Although the Huygens probe found no conclusive evidence of liquids on Titan, images like this would tend to imply that in the recent past there was liquid flowing on the surface. It is probable that it would have been liquid methane, or another hydrocarbon.
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